L2 extension with H1 COS Approved

[jaypiscean]

I am working on L2 EAD with H1B (with COS) approved for this year( by new employer) and i believe my status would automatically change to H1 from 10/1/2013.  
My question is that what will be the impact of L2 extension being filed by my current employer this month.  
What would be my status if  
1. Extension gets approved before 10/1/2013  
2. Extension gets approved after 10/1/2013  
3. Extension does not get approved 

[jaypiscean]

anyone?