Last we checked in with Microsoft at Barcelona, they did not have much to say on the expandable storage card issue with Windows Phone. Remember that fiasco, where AT&T/Samsung were saying you can add memory and Microsoft say you can't, then AT&T reversed themselves? Later, Microsoft promised a list of compatible cards and from our impression and we're not joking, it seems like they actually forgot about the whole issue. (When we spoke with Sandisk, they weren't even aware there was a problem, huzzah).
Now we got word that AT&T is evidently selling (has been selling) 16GB microSD cards that are compatible with the Samsung Focus. Hey, for all we know these might actually work as a large majority of cards do. But we're also pretty confident that these are not "approved" by Samsung or Microsoft and that this is probably just a listing accident (plus, good luck on changing that Surround card!). Heck, we're not even sure how long this has been listed for...but we bet it's been up for awhile.
Anyways, consider this fair warning--nothing has changed on the expandable storage front for Windows Phone.
Source: AT&T; Thanks, Lokitoth, for the heads up