It's been a few months since Sony made its (tardy) entrance into the tablet market, and since then it hasn't been sharing details so much as teasing them in whimsical, perplexing ads. Finally, the outfit's ready to take specifics. We're sitting at a roundtable with Sony executives, and just learned that its clamshell S2 tablet is headed to AT&T's "4G" (read: HSPA+) network, confirming what we already suspected after peeping a tell-tale FCC report. Sony's is quick to remind us that "S2" is just a codename, so don't be surprised
