Xoom owners that hastily shipped off their slates for an LTE upgrade are in for a surprise. Turns out the newly equipped 4G tablets are not only being expediently returned, but also come with an upgrade to version 3.2.2 of Honeycomb. Details of just what's been included in the new firmware are scant, but the main takeaway from Verizon's overhaul is the now functional microSD slot. That's right, unless you were privy to that non-U.S. Android 3.1 update
