From the latest press release:

"The project affected the most with the financial challenges was the Jolla Tablet. As previously communicated, Jolla will only be able to fulfill a small number of tablet shipments to its crowdfunding backers, and has decided to refund all the remaining Jolla Tablet contributions done via Indiegogo. The refunds will be split into two rounds due to financial constraints: round one will see half of the refund paid out now, and round two will see the rest paid out within a year of round one - depending on Jolla’s financial status."

Also the original blog post:

" Due to the financial constraints this will happen in two parts: half of the refund will be done during Q1/2016, and the other half within a year, our financial situation permitting."