Well ALL Android phones in the next few months will have ICS just like all Android phones now have Gingerbread. My Optimus (Nov 2010) had Froyo and my Esteem (Sept 2011) had Gingerbread. It's like you go buy a Windows computer and it has Windows 7, not Vista.
So, it will be ICS. No biggie. ICS doesn't depend on screen size. It's just the current version of Android. Just like all phones released recently have Gingerbread, regardless of size. My
4.3" Esteem has Gingerbread and
the less-than-4" Samsung Admire and HTC Wildfire all have Gingerbread.
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Why a CDMA-only phone?
Metro must figure that there's some demand for less expensive CDMA-only phones -- maybe for teens or housewives who don't know better. After all, they are selling the Samsung Admire and HTC Wildfire, right?
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Again, I have no inside info but until you hear otherwise assume CDMA-only.