Yes. Your micro:bit(s) will still work in exactly the same way and will continue to be supported by Microsoft MakeCode and MicroPython.
You will still be able to use all your resources in exactly the same way as before too.
Any programs you create that use the original micro:bit features will work on your original and new version of the micro:bit, though you will need to connect headphones or a speaker to the original micro:bit to hear any sound.
We are working with accessory makers to ensure micro:bit accessories work with original and new micro:bits.