The phrase "incremental update" refers to making small and gradual changes or improvements to something over time, instead of making a complete or major update all at once. Full definition
However all handsets will get regular incremental updates for 24 months from its launch. (gogi.in)
The e-Reader industry is in a holding pattern, as many of the key players are not investing in new technologies and simply issuing small incremental updates on a yearly basis. (goodereader.com)
This is of course, a beta version only and there will be more incremental updates before the final version is ready and rolling out. (youmobile.org)