Already saw the Radeon HD 7000 release schedule? Some of them especially the lower middle series will be released later this year, but keep in mind that middle series chips are not truly new but a rebrand of the middle series on the Radeon HD 6000. Radeon HD 7300, HD 7400, HD 7500 and HD 7600 will use the same core code as before with Cedar, Caicos, and Turk.
Not to stop there, the Radeon HD 7700 series is also the possibility of still using the same core with Radeon HD 5700 and HD 6700 GPU which uses Juniper. Only in the upper middle class will likely use a new chip or could be a "circumcision" version of Cayman. GPU is truly new is the Tahiti that will use GCN on Radeon HD 7900 series.