I've heard nothing about the LOI holders but it's not a question I've asked. I've not had a chance to have a chat with Captain Lisa Norman (who is heading up the 787 and recruitment team) and find where they're at as far as contacting LOI holders or whether they'll honour them.
They have now sought EOIs for crew to be involved in recruiting/ interviewing so that's another crucial step taken. It's not an answer to the question re LOIs though so sorry about that. Patience though. It's moving forward which is a massive improvement on the last 7 years.
Last course employed have seniority dates of Jan '09.