The downgrade to Neutral suggests that Citigroup believes Blackstone may not offer as attractive a return as previously thought, which could lead to a neutral or slightly negative short-term impact on the stock price. However, the increase in the price target to $124 implies an expectation of some positive performance, which may balance out the negative sentiment from the downgrade. The net short-term impact is likely to be neutral as the market digests both pieces of information.