Ethereum Protocol changes

• EIP-7: New EVM opcode DELEGATECALL
• EIP-2: Consensus rules changes:
• The gas cost for creating contracts via a transaction is increased from 21000 to 53000;
  All transaction signatures whose s-value is greater than secp256k1n/2 are now considered invalid;
• OOG CREATE calls when there's insufficient gas for storing the code (as opposed to silently ignoring the code storage);
• Difficulty adjust algorithm has changed to block_diff = parent_diff + parent_diff // 512 * max(1 - (block_timestamp - parent_timestamp) // 10, -99) + int(2**((block.number // 100000) - 2))
  Fixes / Other
• Decreased minimum accepted gas price
• Fixed windows p2p discover bug
• Fixed transaction sorting
• Implement EIP-8 p2p protocol upgrade
• Fixed downloader OOM

Miners

The minimum accepted gas price for both relaying and block inclusion has changed with ethereum#2273 to 20 Shannon (from 50 Shannon), this because of the recent changes in the price of Ether. You can change this setting with the --gasprice flag when starting up the client and restore the old gas price if desired.