The new 1 Series was launched late last year and the M135i has only just been released.
That would mean on a typical 5 to 7 year production run the current one series will not be replaced for at least another 4 to 6 years.
If a 2 Series comes along then it will be aiming for a slightly different segment than the 1. The 2 series is supposed to be a Coupe and Convertible based on the 1 series chassis.
As you are looking at a hatchback for family duties then you wouldn't be interested in the 2 Series.
http://www.autoexpress.co.uk/bmw/34994/bmw-2-series-way
Your only choice is 1 Series or 3 Series and as they are both excellent cars and both very recent models it's all down to the space/power ratio that you require.
Cheers
Lee