Litecoin (LTC) has reached the required threshold in order for SegWit to be activated and this will soon happen, so all users – miners and exchanges are advised to upgrade to the latest Litecoin 0.13.2. SegWit (Segregated Witness) and CSV (CHECKSEQUENCEVERIFY) will be activated at block 1,201,536 which should hit sometime around 20170511. There are some tips available for pool operators regarding the upcoming activation of SegWit and CSV support for Litecoin in order to make the transition problem free for everyone. You can check this PDF document with some more details on what the Litecoin developers recommend. The relevant BIPs are 68, 112, 113, 141, 143, 144, 147 and you can check more information about them here Bitcoin Improvement Proposals (BIP) should you need more details.