I wouldn't be surprised if they added it later in the tour once the bands have their bearings together.
IIRC, Future Hearts has been out for two years and SWIR turns ten this year. Could either be an alternate version of Future Hearts, a new record, or some SWIR anniversary tour/rerelease.
Well, they've generally been on an every two years release cycle, so I would've expected a new album probably by the summer
The event page for All Time Low's australian tour at one point mentioned a new single in February (it appears to have been removed now, but trust me, it was there), so it's probably that, at least.
Still think it's odd if it is a new album to have the same art scheme as FH, but hey if that's the case I won't be complaining