Good evening, Mr Green
As most people already know, the movie is something of a reboot of the franchise rather than a complete starting over, so in the title credit sequence we get a flashback to how the Hulk was created in the first film (a la Spider-Man 3).
However, there's plenty to please the fan boy. There are references to S.H.I.E.L.D. and Nick Fury, a not-so-secret cameo appearance by a character from Marvel Studios' other comic book movie outing this summer, Samuel Sterns makes an appearance (who becomes the super-villainous Leader in the comic books), as does the future Doc Samson, the Lonely Man theme from the TV show gets a play and Banner's eyes glow green when he's about to change, and (best of all) our hero/anti-hero gets to utter the immortal words, 'HULK SMASH!'
As an aside, weirdly a number of scenes from both trailers for the film (the first released ages ago and the current one) don't actually appear in the film (although there is a scene lifted straight out of The Ultimates comic book by Millar and Hitch), but at least there isn't a gamma-irradiated poodle in this one! And both Stan Lee and Lou Ferringo (the transformed Hulk from the 1970s TV show) both make an appearance, just as they did in the first Hulk movie.