According to VideoCardz.com, we should expect rebranded AMD Radeon R9 200 series cards based on the Hawaii architecture to arrive next month with a disguise, as the Radeon R9 300 series.
While the HBM-based Radeon R9 390X will arrive in two flavors: 4GB and 8GB (and maybe one model with GDDR5 and another with HBM), there will be other Radeon R9 300 series cards based on the Hawaii architecture. These should arrive as the Radeon R9 385, and R9 380 - but those specifics could change. But these new cards will feature slightly higher Core Clocks, and a nice jump on Memory speeds.
The Radeon R9 290X has a Core Clock of 1GHz, but the new R9 300 series rebrand will have 2816 stream processors, while its Core set at 1050MHz, a 50MHz jump. The Memory Clock on the other hand, jumps from the 1250MHz found on the R9 290X, to 1500MHz on the new cards, according to VideoCardz.com. This will give that particular card based on the Hawaii XT GPU around 384GB/sec of memory bandwidth, up from the 320GB on the R9 290X.
The second rebrand will use the Hawaii PRO architecture, which is what makes the Radeon R9 290 stand up and perform. The new Radeon R9 3xx card will feature 2560 stream processors along with its stock Core Clocks of 947MHz, it will be pumped up to 1010MHz on the new card. The Memory Clock also jumps from 1250MHz to 1500MHz providing the same 384GB/sec of memroy bandwidth across its 512-bit memory bus.