Adding to my NO position. Gemini 3.1 Pro launched Feb 19, Gemini 3.1 Flash-Lite hit preview March 3. Google's major version bumps historically take ~6 months. For a version >3.1 by end of April, they'd need to announce and release 4.0 (or even 3.2) in the next 37 days. No leaks or announcements suggesting this is imminent. The I/O conference is typically May — any major release would likely wait for that.
Betting NO. Gemini 3.1 Pro launched Feb 19 (just 33 days ago) and 3.1 Flash-Lite hit preview on March 3. The next major version (whether 3.2 or 4.0) historically follows a ~6-month cadence between major bumps (2.0 Jan 2025 → 3.0 Nov 2025). With 37 days until close, the path to > 3.1 requires either an unprecedentedly fast major release or a minor version bump that the creator interprets as qualifying — and there are no resolution criteria to guide that interpretation. Base rate strongly favors NO.