Well, I posted this elsewhere, but since you asked...
Okay, I won't bet money, but someone asked what they thought the progression of abilities might look like for 4E and this is my stab. If they're into patterns, it feels pretty good and matches what little data points we know.
Basics:
On odd levels (1,3,5,7,9,etc), you'll get a Feat
On even levels (2,4,6,8,10,etc), you'll gain a +1 bonus to most statistics (attacks, skills, defenses)
Powers and Bonus Feats
1 - 2 At-Will, 1 Encounter, 1 Daily
2 - Utility
3 - Encounter
4 - Bonus Feat
5 - Daily
6 - Utility
7 - Encounter
8 - Bonus Feat
9 - Daily
10 - Utility
11 - Paragon Path
12 - Bonus Feat
13 - Encounter
14 - Paragon Path
15 - Daily
16 - Utility
17 - Paragon Path
18 - Bonus Feat
19 - Encounter
20 - Paragon Path
21 - Epic Destiny
22 - Utility
23 - Daily
24 - Bonus Feat
25 - Epic Destiny
26 - Utility
27 - Encounter
28 - Bonus Feat
29 - Daily
30 - Epic Destiny
With a note that utility powers can be either encounter or daily powers depending on their power, and likely most or all utility spots will have the option of either.
I actually feel very good about levels 1 through 16, but I'm a little iffier past that. I'm especially iffy on 20th/21st and the epic destiny spots. It feels good to 'finish' the path/destiny at the end of the level range and to start the new one right away, but it does lead to some real gaps in picking up new powers. I'd not be surprised if those were good levels to swap some of your powers around, and we've already seen that 21st has a big damage boost for at-wills.
I guess there's a decent chance 30th is a Utility, too... or some kind of insane kicker with lots of stuff cause for some reason gaming people like big capstones, but your epic destiny might 'finish' at 31st, when you've retired your character. If it's okay to hold off on getting epic destiny powers until 22nd then 22/26/30 would be pretty solid and let you get in a few more cool encounter and daily powers instead of utility/bonus feats... I really don't like the bonus feat hanging out at 28th instead of a power, though.
Anyhow, was kinda fun to think about. I'm guessing you get 4-5 max encounters and dailies (each), then start to lose old ones to make room for news, but I'm not too worried about the exact number.