This looks to be fire sale of SolarFlare's 10GBase-T PHY. As regards to 10GbE SFP+, it seems like SolfarFlare is already late to the game. Others like Broadcom, Cortina, AMCC, etc., are already well entrenched.
The 10GBase-T PHY opportunities will remain largely at the switches, servers, repeaters and such but not at the desktop / laptop for a foreseeable future. Power consumption improvements & cost reductions will eventually may make it feasible for client nodes but that is still about 3 to 5 years away IMHO. The power consumption of SFP+ PHY's are about 1/3rd of base-T PHYs at 10G but their form factor will preclude applications in desktops and laptops. So CNA's based on SFP will be confined to servers for a while and that is the market already well-captured by likes of Broadcom, Cortina, AMCC!
10G Base T market will grow much more in the future as the technology will always costs lesser than fiber optic based networks. Marvel has been a leader in Ethernet chips since log time and this acquisition will certainly help them a lot.