I'm not sure what table you're looking at, but in the PHB preview I can see the extra cantrip (which is a small benefit), but not any extra slots.
I don't know how neither metamagic nor sorcery points work yet, which is why I said that they (and the other sorcerer's special abilities) should better be good, otherwise the Sorcerer has the same number of spells per day as a Wizard (maybe some of her special abilities allows her cast beyond the daily slots, but I have no idea) but much fewer spells known. She's stuck with 15 while the Wizard will have 3 times at least, and she doesn't even learn any new spell after level 17th (although maybe "Font of Magic" is the ability to swap some known spells... who knows maybe swap one known spell during a long rest?).
I don't think what you describe as the ability to split slots is a big deal. And of course it's possible to always cast a spell with a higher level slot even if it doesn't scale (you just get no scaling benefit), but in general there are (1) plenty of scaling spells and (2) a lot of at-will magic in 5e, so because of these I don't expect this optimization alone to make a major difference.
Rather, I would expect those sorcery points to be usable to augment your spells (i.e. activate your chosen metamagic abilities), and furthermore I expect these points to recharge with short rests, at least partially. Now that would probably make the Sorcerer worth even with so few known spells.