The one vehicle that we do not know really much about is the Night Scythe, a fast moving flyer (fast, skimmer for now). Here is what we know from rumors on this vehicle .
Please remember that these are still rumors. We should have codex information already, but I have not seen any, or heard first hand information on this vehicle.
• Night Scythe: Fast, skimmer (not open-topped). A variant of the Doom Scythe fighter that is a 15 model flyer transport with the 'supersonic' 36" flat-out move that the new flyers (that are really skimmers) have. Can carry jump infantry models (taking up 2 spots each) and fire all its weapons even when moving at cruising speed. Has living metal (chance to ignore crew shaken & stunned) but not quantum shielding (which gives +2 armor until the vehicle suffers its first glancing or penetrating hit). AV 11/11/11 like most Necron vehicles. Has a Twin-linked Tesla Destructor as its weapon.
The transport is done by a wormhole gateway on the underside, the only access point. If the Night Scythe is destroyed, the embarked unit is not deployed, but instead goes back into reserves to arrive normally (i.e. it can't deep strike even if the unit has that rule). This can suck pretty bad for an expensive unit to suddenly get sucked back into Reserves, but remember as long as you have at least one Monolith in your force, you can use its Portal to pull that unit out of Reserves at the start of your next movement phase, so it isn't all that bad!