I'm not terribly fond of the Fighter/Rogue/Mage simplicity folks seem to like, because then it gets to be a complicated mess trying to make a character with all the options and no obvious guidelines or defined archetypes, abilities, or whatnot. And they're just plain bland and boring, without flavor, totally uninspiring. Plus it's just drifting too close to a completely point-based skill/attribute/feat setup that becomes easily abusable by some and needlessly complicated for most.
I'd at least like to see 4E stay closer to its D&D roots and the class-based system that makes it superior to GURPS and other junk for some of us. At minimum I'd expect about half a dozen classes to give players some archetypes and make the classes distinct. I.E. Ranger (wilderness warrior, whether barbarian or just huntsman), Soldier (well-trained warrior, less versatile than Ranger but more skilled at combat), Expert (skill-monkey, versatile and good with many skills, low-mediocre fighting ability), Rake (agile, canny cross between soldier and expert, a swashbuckler or noble fencer or mundane bard), Mage (arcane caster, scholar, item crafter), and Priest (divine caster, miracle-worker, inspirer).
If nothing else....I could see Cleric and Druid being merged as a Priest class. Bard, Paladin, and Ranger fused as an Adept class. Barbarian, Fighter, and Monk fused as a Warrior class. Sorcerer and Wizard combined as a Mage class. Rogue kept or split into an Expert class and a Generalist class. Psionics, if worked in, would likely be a set of options available to Rogues/Experts.