Usually by video-game industry standards:
Incrementing by .01 -> Means there has been bug fixes or balance changes (minor changes overall, no new feature-code required, only numbers tweaking), these updates aren't usually named other than "Hotfix"
Incrementing by .1 -> Means there has been feature additions or significant changes to content / features / balance / bugs, usually these updates are "named"
And there's no indication of "size" of the update between two different .1 incrementation. One can be quite large while the other less so. Though usually, they should always warrant marketing and players coming back to the game for "enough content addition" (where "enough" is pretty subjective).