My opinion: Updated cries resembling the current sounds, but taking advantage of the superior audio capabilities of the 3DS would be appreciated.
As for saying their names, NO. No where in the games (with the exception of yellow) does a monster say its own name (with a few very minor, but understandable exceptions: You can make a Chatot kind of say its name, and Mewtwo says 'Mew' before the fight in Red/Blue, but 'mew' is just the sound a cat makes anyways).
Its a rather silly mechanic introduced in the Anime that I would prefer to keep out of the main series of games.
Regigigas will rule the world! after he finishes his 5 million year nap...