There are some clues on this based on recent discussions about defederation. Lemmygrad is almost universally banned as soon as an instance spins up, so far left is unlikely. The recent conversations about exploding heads are a bit less clear. Some instance operators, including a few big ones, are clearly sympathetic to the far right. But many did reluctantly ban them.

The exact viewpoints of your Lemmy experience will vary based on your home instance. If you want far left, you can have it. Same for far right. Both of these will likely remain small sections of the fediverse. You can also have a very unfiltered view (no banned instances), or a very filtered view (e.g. Beehaw).

I think the common experience, such as a Lemmy.World user will experience, will at least have some limits on how far it leans in either direction. Not because of politics per se, but once you go extreme, it tends to be full of awful people that no one wants to deal with.