At the risk of massively jinxing us we are currently looking very, very good - not just for the play-offs, but for where we will finish in the play-off spots.
This table shows the the points gained by the top 6 teams in the 4 seasons of the A-League which have had 27 games:

In the next table I have extrapolated our current position (28 pts) out to the end of the season based on four different assumptions about the number of points we will get in the last 13 games:

As you can see even if our form over the last 13 games now bombs and is as bad as our average points for those games over the last two seasons (13 pts), we will still end up with 41 pts, which according to history would likely see us finish not just in the top 6 but the top 4.
If we do better than that and can gain the average number of points we've gained in the last 13 games over the past 5 seasons (18 pts), we will end up on 46 pts, which would definitely see us finish in the top 4, and possibly in the top 2.
If we do even better than that and can gain the average number of points we've gained in the last 13 games over the 3 seasons we made the play-offs (22 pts), we will end up on 50 pts, which would almost certainly see us finish in the top 2 but probably just short of being minor premiers.
Finally, if we continue to gain points at our current rate we will end up on 54 pts, which would definitely see us finish in the top 2 and also be a good chance at minor premiers.
Of course, this is all based on history and doesn't account for form in the 2014/15 A-League. It could be a record breaking year. The current 3rd and 4th place teams (Melbourne Victory and Adelaide) are on course to set records for the number of pts those two teams finish on.
Regardless, a top 4 place (and a home elimination final on the 1st or 3rd of May) now looks almost guaranteed and we will be right in the mix for the top 2.