We don’t know yet what they contain but it is exciting news for sure. They must be small since they were found inside the phylacteries and they are probably biblical fragments. I’m surprized that after more than sixty years since the discovery of the Qumran manuscripts were discovered there are unknown fragments. This is a proof of the fact that the work done with the manuscripts wasn’t as professional as it was normal to be, and many thought the same thing, including Geza Vermes. Click this link to read the news article or this other one.