The New "27‑inch iMac With Retina 5K Display"(2015)

The New 27‑inch iMac with Retina 5K display is still 27-inch, and still quad core. Though the i7 processor uses Skylake, but the specs doesn't seem too "special".

Will the iMac with Retina 5K display has a bigger display(larger than 27-inch) and 6-core, or even 8-quare Intel processor?

Should I wait for the "next year(2016) iMac"? Or purchase this year's iMac?

Any advice is appreciated.

Thanks.

Ed