I have learn’t this recently myself, BT Openreach’s New Smaller FTTP Broadband ONT and Mini OLT are without a battery, hence reduction in size.
Use of SmartHub2 is as they say is a *must* but in reality, BT also insist they all DSL kit is BT SIN 498 (MCT) validated, but very few DSL kit is, so more a requirement from a support perspective incase any issues, so use what you would prefer after the ONT and plug back in SmartHub2 if support is needed.
Fibre cable will run to the inside of you house, usually to where your existing Master socket is located and then terminated inside the ONT box, then any onward connection would be your responsibility, (I assume) unless you have a particularly helpful BT engineer 
Officially, BT will install upto 10 Metres inside the premises or to the nearest 13 amp power socket, (usually this is where the DSL master socket is located)
If you pay extra, BT do offer the premium installation service, so will then run fibre to a custom preferred location. (within reason).
https://www.openreach.co.uk/cpportal/products/fibre-broadband/installation-options
In a completely sane world, madness is the only freedom (J.G.Ballard).
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