A handful of large mining pools including those operated by BTCChina and Bitfury have rejected Mike Hearn and Gavin Andressen's XTCoin proposal in favor of a different forking change which would leave them still more influence on their forked blockchain. The pools currently authoring blocks which support the proposal known as BIP 100 currently compromise a bit more than 50% of the hashrate, an amount which if BIP 100 actually had any working implementations would be insufficient to trigger a switch without an attack orphaning all blocks without a "triggering" vote.
At the moment BIP 100 exists as a proposal requesting comments, so it is not possible at the time of this writing to describe any of its points with certainty beyond votes for it being a clear repudiation of the XT effort. As BIP 100 exists now it preserves the 32 MB maximum message size as a hard explicit limit which the blocksize limit must stay under on a BIP 100 forked chain. With so many particulars of BIP 100 not being set in stone yet, it is not unlikely that support for it may wane though at the moment support is likely to persist as a repudiation of the XT effort to hijack Bitcoin.