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As of today nobody knows whether the N55 will be downsized related to engine block / internals.
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I'd speculate the engine is a bit smaller (and probably less robust) as it dropped 40lbs compared to the N54
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The E9x models will continue to use the N54 engine, in a higher state of tune taken from the Z4 sDrive35i.
The N55 engine will be used in new platforms only as it requires a considerable change to the ancillary hardware and mounting components, which would be too costly to implement in a car that is in reality coming towards the end of its life cycle.
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Sounds very plausible. I hope you are correct.