it's possible that I'm just failing at Japan forever right now but
doesn't this mean Q and the final part will be screened at the same time?
Your interpretation is not wrong but there is another interpretation:
THERE IS NO FOURTH MOVIE !!!!
Anyway, it is from the talk in the mini-event in the theater (Vald9, the same one Xard saw Macross Frontier movie) after the showing of the TV version of 2.22 which was hosted by Natsuki Kato, an otaku talento, and Miki Nagazawa, seiyuu of Maya.
Kato - So there will be two movies next, right?
Nagazawa - It used to be a four part series with Q and ?. But now [the two] were merged and became Q.
Kato - So it ends with Q?
Nagazawa - I think... it ends [with that]. I have not heard about that far. So how would it become?
Given Nagazawa was only a seiyuu for a minor character, it is not clear how much she knows about all the plan and schedule of the project, but what she said gave enough concern that perhaps NME will only have 3 movies instead of 4.
There are more about the talk event. Apparently the voice acting part has not started at all yet. Also the story will move swiftly to a grim direction and it is expected to cause divided opinion. Many in 2ch are worried about a second coming of the nightmare of EoE....
And yes, http://yaraon.blog109.fc2.com/blog-entry-3630.html is part of what I have referenced in writing the above.
Last note: 2ch also complained quite a bit of 2.22 got cut in the TV version -- anyway...