Ruaridh Jackson leaves Harlequins to make his return to Glasgow Warriors as the fly-half aims to boost his Scotland career.
South African sides Southern Kings and Cheetahs will join an expanded Pro14 from September, organisers confirm.
Scottish Rugby aims to create a six-team semi-pro league to help bridge the gap between the professional and amateur games.
Hooker George Turner joins Glasgow Warriors on a season-long loan from Pro12 rivals Edinburgh.
Audio & Video
Glasgow Warriors head coach Gregor Townsend looks back on some memorable moments as he prepares for his final match in charge.
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What's on BBC Sport this week
This week's sport on the BBC includes the Challenge Cup final from Wembley, England v West Indies in the second Test at Headingley and the Belgian Grand Prix.