Yes, the pro-fork group say they simply want to change the limit of megabytes per block from 1MB to 2MB. Somehow this is worth forking the network over.

This may not sound like much, but also keep in mind eight months ago it was 20MB, with an eventual jump into the GB range, that they were pushing for. Also, recently they are talking about removing any limit altogether.

This change seems small but the consequences would not be, since it limits who can run a full client and centralizes control to those who can (companies, not individuals).

There are better ways to achieve the same goal and keep the decentralization, but they are not so simple, and need to be fully tested before rolling out. One exciting thing in the pipeline, is a caching layer that sits on top of bitcoin, which allows instant, true microtransactions. In the short term there's "segwit" which also brings all sorts of other advantages.