Above Flightaware site very helpful. Here's what I found currently:
N66051 IAH-HNL
N67052 FRA-IAH
N59053 EWR-FCO Upgraded
N76054 GRU-EWR
N76055 EWR-GVA
N66056 EZE-IAH Upgraded
N66057 EWR-MXP Upgraded
N67058 IAH-AMS Upgraded
N69059 IAH-FRA
N78060 EWR-GRU Upgraded
N68061 HKG getting Upgraded
N76062 HKG getting Upgraded
I also saw the HNL-IAH flight goes to MCO explaining that sighting (and visa versa). I'll keep following this to see if I can figure out the rotation and what gets added as 61 and 62 come back into service.
Looks like EWR-MUC is a 767-200 for now.
Thanks.