Originally Posted by Starbuck_II
Actually, they briefly mention you can multiclass like 3E, pg 7 of the new Class PDF under Warlocks: "Unless you have spellcasting from another source:", how you are getting another source unless you multiclass?
So it proves we have 3.5 version to me.
No, no, that doesn't prove anything. The English language doesn't work like that. The only thing stated or implied there is that it may be possible to gain spellcasting from another source. Nothing more, nothing less. Considering we know two ways(feats and race) to gain spellcasting already, that's not much. It doesn't imply multiclassing, and it certainly doesn't imply 3e style multiclassing. And considering the base +2 weapon attack bonus, and slow progression, we have a definite implication we will NOT have 3e style multiclassing.
Originally Posted by noparlpf
Well they are their own classes. Just with prereqs. Doesn't it seem silly to have two classes, say Rogue A and Rogue B, with identical progressions for the first eight levels before they branch out and get different abilities?
They(PrCs) really are not their own classes, as you can't make a character who just has a PrC, you must have at least one base class, and no I don't think the shift in progression is silly.
Here's the problem with PrC's, you have no idea how they will interact with the rest of the game content. You don't know how their abilities will interact with the rest of the classes in the game, past and future, and you certainly don't know how quickly they can gain the prerequisites. If you have an alternate class feature, you can know that a character who has ability a, is say a level 8 rogue. For a PrC you have no idea what the player did before the PrC, and thus you can't balance the PrC's abilities.