Here's a different thread from earlier in the season with a little info about conditions:
https://bwca.com/index.cfm?fuseaction=forum.thread&threadId=1204414&forumID=152&confID=1 As inspector13 mentions, we're past bug season. Bug pressure will be close to zero.
I haven't hiked the trail this year, but I've never had to posthole through mud/bogs, even when wet. Expect beaver dam crossings, a few logs over streams, and a wet foot crossing at the stream between Shell and Heritage, unless water levels are really low. The Pauness to Shell portage (can be used to access a camp site on Shell) was also flooded by beaver activity, but you can cross on the beaver dam.
Hikers often have trouble with the trail being overgrown, but given that its getting later in the season this should be less of an issue.
Note that the trail rides slower than the SHT. The tread isn't anywhere near as well developed. That said, 3 days/2 nights is pretty manageable.