Yes to charged spells (for maximum effect, not for improved beyond maximum)
and an addition yes for chance of failure:
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On the screen shot from the new update, http://img256.imageshack.us/img256/222/skillsmenu.jpg, you can see a skill to the far left that ends in "AFT" which we can assume is "SPEECHCRAFT"
So we know all magic skills and probably 3 combat skills. Speechcraft would most likely be stealth then.
I want to bring up another observation, and I want this spoken from the mountain tops.
In that picture Destruction is highlighted and its description goes:
- "The School of Destruction covers the harnessing of elemental energies. This skill makes it easier to cast spells like Fireball, Ice Spike, and Lightening Bolt."
Easier to cast -> as in: difficulty in casting -> as in: not automatic success
And I feel very comfortable extrapolating that to:
chance of complete spell failurehell yeah