Love Live Staff has posted the details about the 6th Live and its lottery guidelines. It has been translated by John/@Zeroblade.

LoveLive! μ’s Final LoveLive!〜μ’sic Forever♪♪♪♪♪♪♪♪♪〜
Live details

Date:
March 31, 2016 (Thurs) Doors open: 14:00 / Starts: 16:00
April 1, 2016 (Fri) Doors open: 14:00 / Starts: 16:00

Venue:
Tokyo Dome

Price:
Reserved Seating – 9,800 Yen (incl. tax)

Performers:
μ’s (all 9)

LoveLive! The School Idol Movie BD Limited Edition advance ticket entry:
Entries: Dec 15, 2015 (Tue) 10:00 ~ Jan 17, 2016 (Sun) 23:59
Results: Jan 22, 2016 (Fri) approx. 13:00
Payment: Jan 22, 2016 (Fri) 13:00 ~ Jan 25, 2015 (Mon) 21:00

■For each serial, you can apply for up to TWO (2) tickets PER DAY (total of 4)
■Because there will be a lot of entries, only 1 serial number per person
■You can purchase tickets via regular sales
■Please check the advance ticket or the application site for more details

●Take note:●
※Attendees 3 years old and up require a ticket
※In case there are more entries than seats, seats will be allocated via lottery
※Seating is determined by random lottery; they cannot be selected
※There are other fees required apart from the ticket price
※Tickets will have the purchaser’s name listed; please use the name of the person who will be attending the event. Please bring an ID when going to the event as they will check.
※Selling tickets to others (via online auctions or at a higher price) is forbidden; such tickets will be invalidated.
※There may be changes in the schedule (doors opening/performance start) and performers involved. Refunds for tickets will not be entertained
※Please check the ticketing site for further information

Please be informed that the serial codes are included in the LoveLive! The School Idol Movie BD Limited Edition that’s to be release this December 15, 2015.

Source: Zeroblade’s Facebook (Translation), Love Live! official site