I never got the update. I exchanged my keyboards today because the space bar stopped working. Glad I was still within my exchange/refund period with Best Buy.
This threw me for a bit as I'd got used to shift+3 giving me the hash symbol, whereas it now gave me the pound sign instead (with option+3 giving the hash).
It's finally dawned on me that the smart keyboard takes its cue from the on-screen keyboard. I toggled the on-screen keyboard from UK to US and I've now got the hash symbol back on shift+3 on the smart keyboard (I prefer it that way).