Welcome to MobileRead, ChuckM!

Interesting choice of introduction there.
I think you'd have to ask Sony that question to get a real answer, and they've been pretty mum on future plans so far.
I can tell you that they've made generic comments about being open to supporting other formats, but that the rumors have it that Amazon.com (which now owns Mobipoket) has been less than eager to allow mobi support on devices that support other DRMed formats. In any case, it's not just
Sony that has a say on that particular question.
One other unrelated trifle which you may not be aware of: all caps is generally regarded as equivalent to yelling in the on-line world, so please, unless you
mean to shout, release your caps lock key.