In the public version no
In the midst of a new update, will the saves be preserve or corrupted. Or deleting old game in order for the said update?
As long as your save is not from before version 0.6.5 you will be ok. Anything from version 0.6.5 or after will be good. Just make sure to back up your saves on android first if you are playing on it
My saves are 0.7.0 is is good to go?
Yes you should be good XD