VOCALOID:
The franchise, in terms of voicebank developments, will be so slow. There will be little amount to no brand new voicebanks, though Yamaha will be make us surprised again and again.

True, but it's "little amount", not "no" wwwww, and Yamaha just keep being silent hahaha
Instead, there will be tons of voicebank updates, especially from Yamaha, CFM, AHS, and SHN.

No update haha
CFM will make an update for Piapro Studio in response to V5.

Since they announced that they will developed their own engine and still under Piapro brand, it's kinda true, but I guess that won't happened this year.
Kagamine Chinese will be a real thing.

We'll just wait if it's come true or not, because their birthday is in late this month.
Shanghai Wangcheng will make another controversial thing.

Is that company still a thing? haha
Yamaha will still continue their massive marketing approach, especially for producers outside the community, and will resulting the growing amount of new users, especially for said market, slowly but sure.

They still doing this kind of marketing approach, but I'm not sure about the latter point
UTAU:
Engine updates will be a real thing, though Ameya will be still stuck in Visual Basic 6 hell. Also there will be an official solution for closed-sylable-based and consonant-cluster-based language.

Their released update is just that 64-bit ver of Mac's Utau.
There will be no new resampler engines,

There's an Utau user that actively experiment about resampler development, and releasing the results!
and Kanru Hua will stop the development of Moresampler as he will be so busy with SynthV, though the download link still be kept.
Synthesizer V:
This will be get popular, slowly but sure. There will be so many new voicebanks, and some of them are paid voicebanks. Quadimension/Beijing Photek will make Stardust's new sister into SynthV, though the status is unknown whether it's for public or private release.

A BIG YEAH! And all M5 sisters are all on sale!
Possibly some development for Korean voicebank?

KOREAN VOICEBANK WHO?
Sharpkey:
Namine Ritsu's Sharpkey voicebank and others will be released. English voicebank and UI will be in development.


Sharpkey just rebranded into DeepVocal, and the fact that it's Utau-like community-driven, so yeah!
(though I don't really fond of Ritsu's DV bank.)