Here's a preliminary write-up (credit to Kuroimaken for the basic idea of Surging Magic):
SorcererLevel Special
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1 Summon Familiar, Bonus Feat
2 Extra Spell
3 Surging Magic (caster level)
4
5 Bonus Feat
6
7 Extra Spell
8
9 Surging Magic (spontaneous metamagic)
10 Bonus Feat
11 Extra Spell
12
13 Surging Magic (DC)
14
15 Bonus Feat
16
17 Extra Spell
18
19 Surging Magic (improved metamagic)
20 Bonus Feat
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Summon FamiliarPer the PHB
Bonus FeatAt first level the sorcerer chooses whether or not he has a special heritage.
A sorcerer with a special heritage gains the heritage feat of that type at first level as a bonus feat. So a sorcerer who has choses draconic as his special heritage gains the Draconic Heritage feat. Every fifth level, the sorcerer gains a new heritage feat of the same type as a bonus feat.
A sorcerer without a special heritage gains Eschew Materials as a bonus feat at first level. Every fifth level, the sorcerer gains a metamagic or item creation feat as a bonus feat.
Extra SpellAt 2nd level, the sorcerer learns a new spell of any level he could cast from the sorcerer/wizard spell list. This increases his spells known. The sorcerer can choose to replace this spell on an even numbered level just like any other spell he knows. The sorcerer gains an additional extra spell at levels 7, 11, and 17.
Surging MagicThe sorcerer gains a number of magic surges per day equal to half his class level, rounded down (minimum of 1) plus his Charisma modifier. Only one magic surge can be used per round.
At 3rd level, the sorcerer can use a magic surge to increase his caster level by +1 during the casting of a spell.
At 9th level, the sorcerer can use a magic surge to spontaneously apply a metamagic feat to a spell without increasing its casting time.
At 13th level, the sorcerer can use a magic surge to increase the DC of a spell by +2.
At 19th level, the sorcerer can use two magic surges to apply a metamagic feat to a spell without increasing the spell's level.