I think is a huge opportunity for UE to increase his user base and community, a few considerations:
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The recent news at Unity (just check the blogs and forums) are creating a lot of worries from existing Unity users that might be encouraged to move to UE, and C++ or blueprints are a barrier to entry, especially for people who have invested several years in coding in C# for Unity.
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UE subscription is also a great deal for hobby developers, which in their day job most probably use Java or C#, looking at statisticon job demands, there is 3 times more job requests for Java/C# programmers than there is for C++
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As i understand the project is currently free but you will need a commercial license to redistribute software as mentioned here, I believe the cost is the one mentioned here, that still makes it a better deal than Unity subscription
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Performance should not be an for game scripting, the 1000+ games published using Unity are a proof of that.
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Finally productivity, the reason on C# / Java success is due to its productivity vs C++ (even MS recognises that) and Sketchespromises to improve even that.
At the end I am very happy about news !!!
Fred