Could it be that I still have an old fashioned thinking? I thought so because Shinichi and Ran's relationship was also that way - although it is clear to us through actions and stuff it was never mentioned until a long while later (their relationship was described as childhood friend). It could be that Gosho has decided to come out of his "traditional thinking" and give them a clear cut ending. (Thinking of that, we see that Gosho is getting bolder with his relationship advancement *SatoXTakagi* ok... it seems he's more open than we think)
However, I still believe that there is a chance that the ending would not be very clear since it is very difficult to actually give a "Clear cut once and for all" ending for such a long running series.