100,000 Strong for TimeSplitters 4 is a Facebook group founded by Daniel Wesoly that lobbied Crytek CEO Cevat Yerli to develop and release either TimeSplitters 4 or HD updates of the original trilogy. Though Crytek declined to start up development on anything related to the series (citing 'not enough interest' as their reason), they gave permission to a development team led by Wesoly to create a fan game based on the series in CryEngine 3. The game, TimeSplitters Rewind, is expected to be released during 2017.
Both the Facebook group and its associated petition still exist and are open to new members, though the Facebook group's focus has shifted to the fan game in development as the campaign to cajole Crytek into developing one themselves bottomed out.