Well it's appeared on the m-audio UK site now (no new info except UK price):
http://www.maudio.co.uk/products/en_gb/MicroTrack2496-main.htmlAs usual for this sort of stuff over here, it looks like they just changed the $ to a £ sign which nearly doubles the USA price, at £349... I'll try and call a dealer tomorrow and see if that will be the actual street price. The $399 from US dealers looks good until you add the shipping, and then customs charges - it comes to almost the same, and you end-up with the wrong AC adaptor too.
And thinking aloud, I'll probably answer my own question here but - the info says it has balanced 1/4" inputs - presumably that means it's a 1/4" 'stereo' plug, or is there another type of plug needed to maintain the shielding? And so for phantom power, you'd still need the phantom power adaptors on your mics, and then an XLR-F to 1/4" stereo plug adaptor? I've looked around online and it seems you can get exactly this, but I think I'll make up a couple of extension leads so I can have the phantom adaptors stuffed in my back pocket instead of hanging out the front of the unit.
If the Microtrack is the size and shape of a mobile phone then they should make a clip-on cellphone cover for the ultimate in stealthing - it could be made so that the keypad could operate the record and level controls