The phone size increases are purely reactionary to Android handsets being of similar size. If Android phones were all still 4'', they wouldn't be doing this.
Beats headphones clearly have a low-cost and very high margin, and also the same kind of style/fashion cache that Apple products enjoy. Apple has an opportunity to own that and take the revenue, along with their streaming service. That's possibly all the intention is there.
What do I want? I'd really like Tim Cook et al to stop lying about 'amazing products that are coming'. If all Apple has left is to churn out catch-up revisions to the iPhone and spec bumps for Macs etc then fine, no problem with that, just stop pretending otherwise.