Regular season champs who don't get an NCAA bid are no longer guaranteed an NIT bid. Instead, the top two teams (by NET) from each of the P6 conferences who don't get NCAA bids will get automatic NIT bids and will be guaranteed to host in the first round.
Just took a look through and these are the P6 teams that would have earned automatic NIT bids with home games based on their Selection Sunday NETs last year. This doesn't account for any conference membership shuffling for this year.
Big 12
#43 Oklahoma State - earned a bid anyway but had to play on the road at Youngstown State, ended up advancing to quarterfinals
#63 Texas Tech - declined a potential bid after losing in Big 12 tournament opener and coach resigned
Big Ten
#40 Rutgers - earned a bid anyway and hosted Hofstra in first round but lost
#52 Ohio State - finished 16–19 and did not make the postseason
SEC
#62 Florida - earned a bid anyway and hosted UCF in first round but lost
#81 Vanderbilt - earned a bid anyway and hosted through to a quarterfinal loss to UAB
Big East
#75 Villanova - earned a bid anyway but had to play on the road at Liberty and lost
#77 Seton Hall - earned a bid anyway but had to play on the road at Colorado and lost
Pac-12
#47 Oregon - earned a bid anyway and hosted through to a quarterfinal loss to Wisconsin
#69 Colorado - earned a bid anyway and hosted Seton Hall in first round before losing to UVSU at home
ACC
#46 UNC - declined a potential bid
#60 Clemson - earned a bid anyway and hosted Morehead State in first round but lost
I am unclear what happens if one of these teams declines a bid. Are they now required to accept, or can they still decline and if so, does it then fall to the next team on the list from that conference, or does that conference forfeit an auto spot? Looks like only one team (Ohio State) outright didn't get a bid last year, but there were several others who had to play on the road who would have been guaranteed home games under the new system.
The NIT has announced a number of changes to the tournament format, including the selection process, court regulations and timeout policy.
www.ncaa.com