IMHO I think it will be Red Death or SUROS
Why?
The week prior to hard mode Xur sold the Icebreaker which is almost required in CE HM for Deathsinger and boomer duty on Crota himself. Well, required unless you are good with the Black Hammer or have a Gjallahorn. A fair number of the upgrade items are ones that help with health regeneration or are otherwise useful for fire teams. I think that BUNGiE will continue that trend and offer a primary weapon that has good utility in the Crota fight, namely, SUROS or Red Death.
English
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Interesting theory.... I kinda hope he doesn't sell suros just so it doesn't flood the crucible
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Another part of my Illuminati Confirmed theory: Last week Xur sold the worst weapon in the game yet again. I think that is BUNGiEs way of saying "save up your coins, shyt you need is coming next week". Or it could just be that BUNGiE was punishing the playerbase for buying soooooooo many Icebreakers. /shrug