v1.3.0.0

Change block version to 4 on block height 840,000, this will hard fork 1.1 based client so upgrading is mandatory for those users, upgrading is optional for 1.2 users.
Version 4 blocks brings two soft forks after 75% of the last 1,000 blocks are version 4, those forks are BIP65 and BIP66.
BIP65 - OP_CHECKLOCKTIMEVERIFY replacement for nLockTime
BIP66 - Strict DER signatures

Other changes:
Faster synchronization
Dynamic fees
Improved signing security
Watch-only wallet support
Consensus library
Standard script rules relaxed for P2SH addresses
bitcoin-tx separate tool
Mining and relay policy enhancements