You're looking at Year 1 weapons without being converted into Year 2.
Should be 280 attack once ascended.
Year 1's can't be ascended. SOME year 1's have a year 2 version that is unlocked if you already have the year 1 version. You have to buy the year 2 version for legendary marks.
A harsh way to summarise the reveal yesterday was:-
All year 1 exotics are no good for end game content
Some can be ported across to year 2 for a reasonable amount of grinding
Gjallarhorn cannot be ported so may never be useful again
You start with 0 new legendaries and nearly all of them are gated behind legendary marks which have to be earned.
The main things you get to carry across to help you progress with year 2 will be:-
Mats and glimmer for upgrades and gunsmith legendaries
Strange coins for Xur and whatever new stuff he sells
Motes to help level weapons faster, and possibly get engrams from Xur
Faction and cryptarch reps
Mats/Motes/Ammo to pledge to factions to get faction packages with legendaries in them
Your level 34