That was my thought process leading to the conclusion that HARM may premier far earlier than being rumored.
You wouldn't do all this testing just to then have all the equipment go idle for 3-5 months.
I could certainly see a situation where HARM runs as a "soft" show over the summer, with the gradual introduction of further elements, with the "official full premier" of HARM coming October 1.
That would make more sense than running Epcot Forever every night at 9pm, only to then launch more fireworks testing multiple nights per week at midnight.