Hi Alain,
SIA will get its first A380 in Nov/Dec of next year; Emirates will gets its first aircraft in/about April 2007 (although Tim Clarke, EK's CEO, has said he's not altogether convinced of this - and is dangling the expected A350 order as a means to "encourage" Airbus to deliver on time).
The Dubai Air Show was held last month and since EK is a pretty sizeable A380 customer (the biggest by a long way) and since EK is a big Airbus customer, an A380 was painted in EK's livery for the show.
I don't think the one painted in EK colours is actually going to EK; indeed, ironically, two of the test aircraft (possibly including that one) are going to find a home a few miles down the road in AUH, with Etihad.