(I wasn't sure where to post this, but I figure it is mostly new rules ideas, so I posted it here.)
Currently the PRPG Sorcerer is underpowered compared to the Wizard, a problem it suffers from in 3.5 as well. It is also still very similar in flavor, even with the various bloodlines. The idea I have is to turn the Sorcerer into something akin to the Battle Sorcerer variant in Unearthed Arcana.
Firstly, increase the Sorcerer's BAB to 3/4 per level, thereby increasing its hit die to a d8. Additionally, allow the sorcerer to cast spells in light armor without an armor check penalty. Perhaps fill in one of the dead levels with an increase of this ability to Medium Armor, or even Heavy Armor (although I am unsure whether the better armor types make the class to powerful).
Giving the Sorcerer a light or one-handed martial weapon prof also increases the combat capability. This would also allow for a minor reworking of some of the Bloodline feats, allowing a few combat feats to sneak in.
Unlike the Battle Sorcerer variant, it might not be necessary to decrease the known spells and spells per day of the Sorcerer, the class already runs far behind the Wizard in spells known and in spell levels.
The finished class has sufficient flavor and mechanical difference from the wizard, and is more powerful than the original Sorcerer, although I am unsure of whether it is in line with the Wizard, or any of the other classes, for that matter. One major problem this suffers from is backwards compatibility. If this or a similar concept were to be used, the Sorcerer would be the class that is hardest to update a PC or NPC in. What do you guys think?