Yeah, usually they are one per season. In fact in the last news article, they already gave a name to the next test and it is "Summer Alpha", so we can expect it in August at the latest (provided that there are no delays). In any case, it looks like we are going to receive an update to the development roadmap, so I suggest that you wait for that and make your decision. By the way, hop on the discord, it will be easier to follow the news.