Speaking with my dealer yesterday (Robinsons in Norwich), their view was the Cali version of the fully electric Buzz would arrive alongside the people carrier late 2022 / early 2023. They felt any worries about cabin space being too small were unfounded due to the significant space freed up by not having the combustion engine, mechanicals, etc. And further space would be saved if the ‘camping’ electricals (& gas) are also combined with the main vehicle batteries - which they felt they would / should. For me this all passed the common sense check and made sense.
The long lead times and imminent arrival of the new model aren’t dampening sales though - the salesperson said their [only 2] showroom vehicles were sold (both at full retail price), and they only had a handful of used commercial vans vs. a usual stock of 30+.