A Plan for Using Newer Bootstrap and/or more Flexibility with Grid, etc.?

Moving to Bootstrap in Flex has been great! 

However, as layout options are increasing, and with new versions of Bootstrap, is there a plan to keep things up-to-date?

It's definitely not urgent now, but wanted to see if there was a plan in order to prevent things getting as stale as "Zen" got by the time Flex rolled around.