Well we know the Krait is a Medium. Fact.
There's a gap in Medium sized ships for something properly fast, ie: 300 base speed, 380-400 boost speed (ignoring EPTs).
Small: Cobra MK3, iEagle, Viper MK3 = 300 +/-20 base, 400 boost
Medium: FDL = 260 base, 350 boost
Large: Clipper, Orca = 300 base, 380 boost
Even the AspX is 250 base, 340 boost, which is not far off the FDL. So a Medium which does 300 base, 380-400 boost is a definite gap, and prime for a "pirate" multirole to plug.
I'll be very happy if the Krait slots between the Cobra MK3 and Clipper, as the fast medium multirole.
Again taking those other two ships: Cobra has 6 slots, Clipper 8; so 7 slots would be right in the middle; 4x medium; 3 utilities; 30-ish Ly jump range (40-ish explo fit).
If the SLF bay is taken, the weight may slow it down but (sort of) give it FDL firepower, while skipping a fighter bay lets you slot right into the Cobra/Clipper hole.
Ditto flight style like those other two, which would still allow the Chieftain to be "more manoeuvrable", if the Krait is more a boom and zoomer.
I guess we'll be waiting until Q2 now... as FDev don't seem to do "just one more thing" moments.