My SynthV 2 trial just ended so...
-Because I have Yamine Renri (SV1 standard voicebanks are ported as SV2 "Plus" voicebanks, and Renri is the only free full SynthV), I can still use the feature-limited version of SV2.
-I am not allowed most of the tuning and customization options (such as pitch bend and parameters; control points don't work on Renri anyway), but note-bending works...off and on (sometimes the autopitch fights it). Sadly I can't apply vibrato, except by painstakingly note-bending it into existence. If need be I suppose I can tune with Vocalshifter or something.
-Unlike SynthV Basic, cross-lingual is available, but only track-wide; note-level cross-lingual is grayed out as are most of the other note settings.
-It does not restrict you to a 40-note limit if you're not using a trial.
-You're only allowed 1 track; new tracks are automatically perma-muted.
-Voice to MIDI is unavailable.
-Phoneme editing is available within the language you're working in.
-You can technically "generate takes" but I don't think it does anything?
-Rap mode is available.
-Non-trial vocals can have their audio rendered.
-VST and ARA plugin versions are available.
TL;DR:
Unavailable: Parameters, pitch bend, note settings, note-level cross-lingual, phoneme timing, voice-to-midi, >1 track, working AI retakes
Available: Track-level cross-lingual, note splitting, phoneme editing, audio rendering (for non-trials), a "Generate take" option that doesn't really do anything, standalone and VST/ARA plugin, Sing and Rap mode