Any word on when they are going to add the excalibur and other ships to the fleet store?

Not sure they're ever going to add the Excalibur/Vesper/Exeter to the Fleet store - their reasoning thus far? No T5 Constitution.

The Excelsior, Galaxy X, B'Rel, Garumba and possibly the Kar'Fi (can somebody tell me if the Phase Shift generator is a console? StoWiki doesn't say) aren't available in fleet versions because they all have powers that are not console based. The Bortasqu variants are the fleet versions (10th console slot anyway).

First of all, thats not really a valid excuse because all they have to do is lock out the connie skin. Second, that is not "their reasoning"; they(the devs) have given no reasoning. That is simply speculation from players.

Personally...

I wanna see the KDF T2 ships (specifically the K'Tanco) get the Fleet Treatment. Heck, I'm all for ALL non-lockbox/non-Lobi ships to get a Fleet variant at some point.

I'm inclined to agree here, due to the fact that in one of the past Ask Cryptics, this subject was brought up and they gave a vague response, something along the lines of: "Well, we wanna add new Fleet Ships with each successive Season, so keep an eye out for your favorites, folks!" In the past, they went to the CBS/T5 Connie line, but not that time.

And I don't really buy the "built-in powers" excuse, either.

P.S. The Kar'Fi's Phase Shift power is, IIRC, a console.

Phase shift generator IS a universal console.

Yeah the fleet karfi and dacoit will be coming out soon after s6 release.
They realize that there was a hige discrepancy with the factions and wanted to fix that when they had time