Nukapedia has an audio interview with "Three Dog" voice actor Erik Dellums. Of course, they can't really address the rumors floating around Fallout 4. Dellums talks a little bit about the response, but his "lips have been sealed, they're very private people (...) Bethesda tries to keep things as secretive as possible", as per their typical MO. Dellums seems like a good guy so it's a fun interview about his career and (voice) acting, but don't expect any new information.
It seems the hype from his tweet has actually been doing his career very well. That's cool!