Yes, for those not from the state, all 10 Representatives are Dems at the moment. That could change including (hopefully)
Republican challengers:
GUNN 1st Dist v. Olver
HUDAK 6th Dist v. Tierney
BIELAT 4th Dist v. Frank
PERRY 10th Dist. v. Keating (open; was Delahunt-D)
GOLNIK 5th Dist. v. Tsongas
etc
Charley Manning is discussing this on his show right now.