Incidentally when they say "Swiss Engineering To Close The Gap" they're not just talking about TAG Heuer branding in the marketing sense, Mario Illien has been on Red Bull's payroll for a while now trying to work with Renault to improve their engine and is in fact a Swiss national himself.
https://en.wikipedia.org/wiki/Mario_Illien
Illien (former co-founder of Ilmore - now Mercedes AMG High Performance Powertrains) presented his design to Renault which they then ignored in favour of their own updated version which as Red Bull demonstrated in Interlagos was worse than the existing engine.
So its rather appropriate really that if it does become RedBull-TAG, it will in fact be a true Swiss engine design even if it shares some initial elements with the Renault.
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