My question involves landlord-tenant law in the State of: NY

I just signed a lease renewal (a short form) of an already existing full lease. The new lease takes effect May 1, 2011. It takes a few weeks for the renewal to get approved and returned to me. During this period, if I decide to move out, can I ask the landlord to get out of the renewal, or am I legally bound even though it's almost two months for the new period to kick in? How much LEGAL flexibility is there? Thank you for your help and advice.