That haven't given a date for land selection yet.
However, there is always the risk you might be off when it's planned. Obviously the main risk is that you'll slip down the picking order as a result, but would still ultimately get a selection.
I don't think realistically they can make each wave of selections drag out for weeks before opening the next or it might literally take all year to complete.
If possible I'd aim to plan ahead for that sort of eventuality - if there's anyone you can trust to do it for you in the event of your absence, give them details of what you're looking for.
That way, when the selection announcement does eventually come, if you're away for any length of time you'll be sorted.