Announced at OCP in March 2017. The blurb from the press release says:
To meet the need for optimized 25 GbE top-of-rack switching, Edgecore is contributing the specification and design package for the AS7300-54X open network switch, based on the Broadcom StrataXGS Tomahawk Switch Series, providing 48 x SFP28 ports each capable of 10 GbE or 25 GbE, plus 6 x QSFP28 100 GbE uplink ports.
The Edge-core web site is way behind announced products. It does not acknowledge any 25 Gb/s products.