VideoCardz claims the Radeon R9 370 series will use the Trinidad GPU, which according to earlier rumors may be either a new design or an altered Pitcairn.
AMD Radeon R9 370 is supposedly equipped with Trinidad PRO processor. XFX is working on R9 370 Core Edition (R9-370A-ENF) equipped with 2GB and 4GB GDDR5 memory across 256-bit interface. The card will be powered by single 6-pin power connector and will require 110W to 130W. XFX R9 370 Core Edition will be equipped with two Dual-DVI ports, HDMI and DisplayPort.The site also notes that AMD's Bermuda GPU will not be a high-end model, this codename is rpeortedly reserved for a mid-range solution, possibly the Radeon R7 360 series, and that the R7 340/350 lines are based on Oland (possibly codenamed Samoa).
That said, Trinidad is Curacao (Pitcairn) replacement. Radeon R9 370X will most likely feature Trinidad XT, whilst R9 370 will feature PRO variant according to this leak.