No, i mean, what if they released that new Inferno book just so they could keep the trademarks without announcing a game.
No good, since the trademarks relate to video games and clothing, not books. They have to announce TES:V Skyrim as the next game in the series if they intend to hang onto the trademarks.
To summarize the recent developments:1) There's no reason to renew those trademarks to the skin of their teeth if they are just going to be dropped at the end of it all.
2) July GI is not TES:V, leaving one more to contain it (two at a stretch).
3) Pete Hines said E3 was not the place to look for announcements, and stated that QuakeCon would be the most likely place to look for them, as well as saying that Bethesda and ID are looking to boost the appeal of that convention.
4) GStaff cleared up the rumours regarding a 'secret' announcement by Bethesda in http://www.gamesas.com/index.php?/topic/1094662-e3-2010/page__st__160, and SyltStrider recently found evidence that Bethesda had not claimed to have a secret announcement, but simply refused to comment on their E3 showlisting. It's worth considering that their E3 listing seen on the Bethblog probably hadn't been published when Famitsu ran their 'secret announcement' survey.
Conclusion? Don't get your hopes up for E3, even though it is still a possibility (we know how devious Bethesda can be). They clearly intend to use that trademark though, which ends at the start of August. An announcement before it expires, coupled with an August or September Game Informer cover, with the promise of a QuakeCon demonstration or first-ever trailer is a tantalizingly believable outcome.