The problem seems to have been solved with the new release of TeX Live 2013 (presently in test version). Here's the output obtained with
> lualatex --version
This is LuaTeX, Version beta-0.76.0-2013052718 (TeX Live 2013) (rev 4627)
Execute 'luatex --credits' for credits and version details.
There is NO warranty. Redistribution of this software is covered by
the terms of the GNU General Public License, version 2 or (at your option)
any later version. For more information about these matters, see the file
named COPYING and the LuaTeX source.
Copyright 2013 Taco Hoekwater, the LuaTeX Team.

And here's the file list
*File List*
article.cls 2007/10/19 v1.4h Standard LaTeX document class
size10.clo 2007/10/19 v1.4h Standard LaTeX file (size option)
fontspec.sty 2013/05/20 v2.3c Font selection for XeLaTeX and LuaLaTeX
expl3.sty 2013/03/14 v4469 L3 Experimental code bundle wrapper
l3names.sty 2012/12/07 v4346 L3 Namespace for primitives
l3bootstrap.sty 2013/01/08 v4420 L3 Experimental bootstrap code
luatex.sty 2010/03/09 v0.4 LuaTeX basic definition package (HO)
infwarerr.sty 2010/04/08 v1.3 Providing info/warning/error messages (HO)
ifluatex.sty 2010/03/01 v1.3 Provides the ifluatex switch (HO)
etex.sty 1998/03/26 v2.0 eTeX basic definition package (PEB)
luatex-loader.sty 2010/03/09 v0.4 Lua module loader (HO)
pdftexcmds.sty 2011/11/29 v0.20 Utility functions of pdfTeX for LuaTeX (HO)
ltxcmds.sty 2011/11/09 v1.22 LaTeX kernel commands for general use (HO)
ifpdf.sty 2011/01/30 v2.3 Provides the ifpdf switch (HO)
l3basics.sty 2013/01/10 v4428 L3 Basic definitions
l3expan.sty 2013/02/03 v4458 L3 Argument expansion
l3tl.sty 2013/01/08 v4415 L3 Token lists
l3seq.sty 2013/01/12 v4434 L3 Sequences and stacks
l3int.sty 2013/01/13 v4444 L3 Integers
l3quark.sty 2012/11/04 v4268 L3 Quarks
l3prg.sty 2013/02/13 v4459 L3 Control structures
l3clist.sty 2013/01/08 v4414 L3 Comma separated lists
l3token.sty 2013/01/10 v4428 L3 Experimental token manipulation
l3prop.sty 2013/01/09 v4423 L3 Property lists
l3msg.sty 2013/01/08 v4412 L3 Messages
l3file.sty 2013/01/14 v4446 L3 File and I/O operations
l3skip.sty 2013/01/13 v4444 L3 Dimensions and skips
l3keys.sty 2013/02/24 v4461 L3 Experimental key-value interfaces
l3fp.sty 2013/01/19 v4449 L3 Floating points
l3box.sty 2013/01/08 v4411 L3 Experimental boxes
l3coffins.sty 2012/09/09 v4212 L3 Coffin code layer
l3color.sty 2012/08/29 v4156 L3 Experimental color support
l3luatex.sty 2012/08/03 v4049 L3 Experimental LuaTeX-specific functions
l3candidates.sty 2013/03/14 v4468 L3 Experimental additions to l3kernel
xparse.sty 2013/03/12 v4467 L3 Experimental document command parser
luaotfload.sty 2013/05/23 v2.2d OpenType layout system
luatexbase.sty 2013/05/11 v0.6 Resource management for the LuaTeX macro progr
ammer
luatexbase-compat.sty 2011/05/24 v0.4 Compatibility tools for LuaTeX
luatexbase-modutils.sty 2013/05/11 v0.6 Module utilities for LuaTeX
luatexbase-loader.sty 2013/05/11 v0.6 Lua module loader for LuaTeX
luatexbase-regs.sty 2011/05/24 v0.4 Registers allocation for LuaTeX
luatexbase-attr.sty 2013/05/11 v0.6 Attributes allocation for LuaTeX
luatexbase-cctb.sty 2013/05/11 v0.6 Catcodetable allocation for LuaTeX
luatexbase-mcb.sty 2013/05/11 v0.6 Callback management for LuaTeX
fontspec-patches.sty 2013/05/20 v2.3c Font selection for XeLaTeX and LuaLaTeX
fixltx2e.sty 2006/09/13 v1.1m fixes to LaTeX
fontspec-luatex.sty 2013/05/20 v2.3c Font selection for XeLaTeX and LuaLaTeX
fontenc.sty
eu2enc.def 2010/05/27 v0.1h Experimental Unicode font encodings
eu2lmr.fd 2009/10/30 v1.6 Font defs for Latin Modern
xunicode.sty 2011/09/09 v0.981 provides access to latin accents and many othe
r characters in Unicode lower plane
eu2lmss.fd 2009/10/30 v1.6 Font defs for Latin Modern
graphicx.sty 1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)
keyval.sty 1999/03/16 v1.13 key=value parser (DPC)
graphics.sty 2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)
trig.sty 1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg 2010/04/23 v1.9 graphics configuration of TeX Live
pdftex.def 2011/05/27 v0.06d Graphics/color for pdfTeX
fontspec.cfg
t3cmr.fd 2001/12/31 TIPA font definitions
supp-pdf.mkii
epstopdf-base.sty 2010/02/09 v2.5 Base part for package epstopdf
grfext.sty 2010/08/19 v1.1 Manage graphics extensions (HO)
kvdefinekeys.sty 2011/04/07 v1.3 Define keys (HO)
kvoptions.sty 2011/06/30 v3.11 Key value format for package options (HO)
kvsetkeys.sty 2012/04/25 v1.16 Key value parser (HO)
etexcmds.sty 2011/02/16 v1.5 Avoid name clashes with e-TeX commands (HO)
epstopdf-sys.cfg 2010/07/13 v1.3 Configuration of (r)epstopdf for TeX Live
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