Hello Patrice and welcome to the forums.
The time-limited offer will end as soon as we move out of Beta and release v1.0. We plan to release a few more betas with lots of great new features before doing so, so it will likely last at least 3 more months, though it could be longer.
However, the special offer is very inexpensive and it comes with 1 year of free updates, so if you want to secure it, I strongly recommend you to get it without waiting. In case you want to purchase more licenses for multiple developers, you will have more time to do so if you start purchasing now.
By the way, stay tuned, Beta 4 is almost ready, with Linq. Async/await, DataGrid, ComboBox, CheckBox, faster simulator, and a lot more!
Feel free to let me know if you have any other questions. We are here to help.
Thanks again and have a good day,