Aptitudes have made a reappearance in the new beta, along with a Google docs spreadsheet you can use to calculate costs in another thread in this very forum.
I'm not a big fan of Aptitudes. They're a nice idea. The problem with DH1 is that each character class is locked into a specific table of advances and can't take anything outside of it. With BC/OW, they quite wisely opened up character creation so that any kind of character could take any advance. In order to maintain some character specialization and not make characters too samey, Aptitudes were introduced to affect the costs of advances. So the smart guy got a discount on smart skills and the shooty guy got a discount on shooty skills. Nice idea.
The problem is that, in practice, figuring out how much it costs to purchase anything takes way too long. You've got to flip to the character advance cost table, flip back to the skill or talent page to get its associated Aptitudes, its tier, then back to the table to figure out how much you need to pay to get it by cross referencing two tables half a book apart and your character sheet. Very clunky in actual practice.
This system would work great, however, if all of that cost calculation was done for you. The original DH2 beta had sort of a half measure - each Role had a table that was essentially the costs derived from assumed Aptitudes that you used to figure out the cost. For talents, the cost was listed along with the talent's description You still had to do some math, but everything you needed to know was right on one page.
But back to Aptitudes. They wouldn't be a problem if all the work was done for you. It's 2013 - why is figuring out how to advance my character such a chore? With that in mind, I call on FFG to put out an electronic character sheet that will do these calculations for you. Maybe something that will you can use to print out a table for the cost of every advance for your character. The rules for the calculations are simple. Make it easy for us.