The current Tyranid book came out Jan-2010. It's undergone some pretty sweeping changes. Immunity to ID has been removed, and most units have been redone so that there are fewer options but often more of the old options are simply built in. This has worked with differing levels of success.
The newest models to come out for the Tyranids are the Hive Guard, Trygon, Pyrovore, Venomthrope, Death Leaper (actually a re-release of a splash release IIRC), new Raveners, and new plastic Gargoyles. Supposedly at some point there will be models for the Tyrannofex, Harpy, Tervigon and other units without models, but probably not for a while.
Overall Tyranids aren't a terrible army, but are sorta awkward and hard to balance right.
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