Antoine Certainly not before kernel version 5.10.1 gets released. The current kernel is outdated and the devs don't want to release an iso with an old kernel. The problem is that starting with kernel 5.7 there have been NVMe issues which were only recently fixed and will be part of the 5.10 kernel release. Then the team usually waits until at least the first point release of the kernel so Solus users don't have to deal with bugs that get discovered after the inital release.
Of course that is only one of the factors delaying the iso release, but it's a lower bound for when a new iso can realistically be expected.