Hello Koiyoucett12
There is nothing to worry about it.
This is totally normal as the annual construction works along this line will take place. And, the bus schedule is not out yet but you can expect a bus service just as you would travel by train.
There is no need to purchase the tickets now. You can even do this on the day of travel, ir like a Swiss, 2 minutes before departure.
It is not possible to purchase the ticket elsewhere, the ticketing system is everywhere the same, and it has not yet the connection programmed.
Kind regards,
Roland