"Trends" sounds a wee bit like "fashion" - as in "short lived", where as to me architecture has a bit more gravitas. Having said that: people will always leap on to "new" ideas (re-package old ones) but it's sometimes hard to discern between genuine architecture "trends" and marketing / Marchitecture based ones.
Just to pick on SOA for a minute - SOA might seem like a new thing to some people - but to others it's been around for a while (2005 depending on how you look at it).
Current trends in Architecture
Here's some topics I'd do some research into if I was in your shoes:
- The Cloud: this is clearly gaining a lot of popular momentum; as the Cloud (or our Cloud based thinking) becomes more mature (and Cloud services become more of a commodity) it provides options not previously available or as accessible.
- Multi-Tenancey: with more and more services being delivered through shared servcies there's a clear benefit in being able to deliver these using a multi-tenancey based approach.