Here is the recent update from Wilson over at Bolt Airsoft. BOLT's recently are releasing Sport a new line of models and new SWAT series!

B4A1 ELITE models <SPORT LINE>
Featuring: New Stronger Recoil System (Enhanced B.R.S.S.) / Lighter and Precise Accuracy / Polymer Handguard / Cheaper!

B4A1 ELITE DX
B4A1 ELITE SD

SWAT Series

Different than their M4 and BR47 series, it’s another new product line of BOLT, Sportive models with all their Recoil knowledge included.

SWAT A5 TACTICAL & SWAT A4 TACTICAL is released by now (end of May 2017).