In LeSS we say that there should by just one person to set priorities in multi-team environment. So the question is it the same for product roadmap planning? Our ALV friend Elad will be talking about this and more to see what's what.
Elad will be doing a LeSS practitioner course on the dates in Riga and you still have a chance to get a discout for it:
10% off with the code Agile_Latvia for early birds and regular tickets and 5% off for groups of 3 or more with the code Agile_Latvia_2 , expires on the 16th. More details here: http://bit.ly/Riga_LeSS