Intel launched new processors Broadwell-U . New Apple products should be expected for 2015 expecially for portables.
A significant performance improvements for the new chips have been observed expecially for Core-i5 (from 1.4 and 1.7 Ghz to 1.6 and 2.2 Ghz).
We hope that also iMac starting model will receive hard improvement (1.4 Ghz Core-i5 iMac benchmark disappointed final user).