To add to the whirlwind of rumors... A Macintouch reader claims to have seen an advertisement for an Apple/Sony-Ericcson phone in a "new" Mac Magazine called "iCreate" in the U.K. (inside back page, Issue 1)
According to the blurb, the full-page add depicts the device, and was "in a local newsagent" today.
This should be easily verifiable (or discounted) by our U.K. readers.
Update: Apparently the ad is actually a concept shot done by the magazine. Photos of the concept ad are attached in this discussion thread.