I've just purchased 6 Leader Light LL Stage 6-06D LED Battens, and to my dismay, they were not available in the EOS Fixture library.
a) provide a PDF or url link to the documentation for the device
There's not much info here: http://www.leaderlight.eu/pdf/data/2016_LL_STAGE_BEAM_.pdf
However, there's a GrandMA2 Fixture Profile: http://www.leaderlight.eu/pdf/personal/leader_light@ll_stage_6-06d@6_ch.zip
b) provide a "need by" date
As soon as realistically possible, but I don't have them booked out on any gigs yet, so there's less urgency to this situation.