I'll make this short and sweet, as it's something I thought about last night and would like others input.
Bungie stated the exotics will come along with us on the Journey.
The Twitch reveal showed some exotics without the year 2 status or attack.
The update regarding Gallajrhorn: If you read the update carefully they say that "a select few exotics will be redesigned and redeployed for year 2"
The question asked was "will you be [b][i][u]REDESIGNING[/u][/i][/b] Gallajrhorn?"
The reply was something along the lines of "No, Gallajrhorn is staying at year 1 levels, as a year one exotic."
"Levels" may be Bungie's new redesigning method, to allow for extra tiered or alternative perks.
Thus, I believe that all Exotics will move one to Year 2. The ones remaining Year 1 will have upgradeable perk bubbles for attack, but effectively remain Year 1 in style and perks. The select [b][i][u]REDESIGNED AND REDEPLOYED[/u][/i][/b] Exotics will be fully upgraded to Year 2 attack values with new perks or an alternative tier.
tldr: Don't get rustled fellow Guardians, I think Bungie will take care of our Bebbehs!
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They 're Exotics for a reason.