No actually manufacturable "breakthrough" technologies in sight AFAIK. A lot of press releases, as always. But you never know. One of them might be up to something.
Breakthrough likely not needed, though. Li-ion optimization (series of "small breakthroughs" and micro-optimizations) has not slowed down, and energy density has reached around 290Wh/kg, demonstrating approximately 40% increase per 10 years (1998 - 140Wh/kg; 2008 - 200 Wh/kg; 2018 - 280 Wh/kg). Usage of expensive active material is still going down, don't have exact numbers but price per capacity is clearly dropping a lot faster then the energy density is increasing.
AFAIK silicon is now being successfully used in the anode (not alone, but together with graphite/carbon).
Future? Based on what I have heard, it's fairly safe to assume the current development still goes on until about 350-400 Wh/kg. Halving the price per capacity seems possible. This is something that will happen during the next 10-15 years. IMHO, these expected numbers (Wh/kg and $/Wh) enable almost 100% electric mobility, because even with the current numbers, we are already pretty close. It might not be enough for 100% revolution in aircraft, though. I guesstimate somewhere over 500-600 Wh/kg would be preferred for that. For limited range aircraft commute, in busy central Europe for example, the li-ion technology we see in the next 10 years could be acceptable.
Any real breakthrough is possible, and would be a massive extra boost, but it's extremely hard to know based on press releases. Most (99.99%) lead to nothing, and there is a lot of competition from investor money.
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