Re: Yuck.
It isn't real supernatural occurances, the villain just happens to be a Satanist who is inspired by Aleister Crowley.
"Sherlock Holmes is a vaguely misogynistic manic-depressive who has to turn to drugs to satisfy his unnaturally insatiable intellect, living in a dank and dirty London filled with depressingly dull personalities, one or two of whom might provide him with some sort of challenge for a day or two. This was Conan-Doyle's skill, and hence Holmes'; to take situations and events that would seem extraordinary - e.g., returning from the dead, begging for a living, being savaged by a spectral hound - and pull away the curtain to show that they had a logical and/or mundane explanation, grounding them in the reality of their audience in a similar manner to Dickens' attempts to demonstrate the ravages of poverty throughhis own work."
This is the route they're taking.
Although the director has said that they are going to use some of the more action orientated stuff from the books that is often excluded from other adaptions, being able to box and straighten a poker with his bare hands for example, this IS just the trailer.
They have to put the more exiting bits in, because people standing around describing things aren't exactly gripping cinema, despite that being only a piece of the character it isn't exactly going to look that interesting on the trailer.