I thought people might be interested to know that Vu+ have posted on their Facebook website that the Solo2 will be released by the end of the year and the Duo2 is in final stages of development.... the post reads
" Thank you for your interests in Vu+ products. Solo2 will be released at the end of this year, while Duo 2 is in the final stage of development. Thank you for your patience in advance! Best Regards, Vu+ Team"
Hope that helps