I've been wondering about this. There was a piece of misdirection when they showed a Harrison Wells on the roof with a rifle in the future during the Savitar confrontation. The implication was that it was HR. But that could easily be Harry, who has shown a lot more willingness to use guns than HR. So HR could be Savitar. I'd much prefer this to it being Wally, and I hope they wouldn't drop in Bart without a lot more warning.
Is it bad that I WANT HR to be Savitar? He kind of bugs me, and is my least favorite version of Wells. I like Wally too much in a hero role to see him wasted on becoming a villain, and it'd be satisfying for HR to be bad the bad guy since Cisco has had misgivings about him from the beginning and I just want everyone to listen to Cisco for once. HR as Savitar is definitely my preferred route.