It's not straightforward. The media is hotting up on the issue. More coverage, more heat.
From the start, the newspapers ranged from hostile (the Sun, the Record, the Scotsman) to sceptical, but more nuanced (the Herald). The language in the Herald, though, has been changing. It has been edging towards more favourable coverage of the issues. Whereas all the other papers frame the debate with headlines more negative towards Yes, seeing every issue as "putting pressure" on the Yes campaign, things like that, the Herald tends to be more neutral in that respect. The Herald also tends to use the word "independence", whereas the others will use "separation" and "separatism" wherever they can.
I think there is a class dimension, as Radical Indy suggest. I haven't seen polling that breaks support and opposition down by socio-economic class, so I don't know what extent that applies, but it is certainly the case that the backers of the No campaign are the big business interests, whereas the Yes campaign backers are more likely to be individual celebrities.
It's interesting to note that almost all artists, musicians, writers etc who have come out on the issue back independence. Those backing No, Dave Allen could count on one hand: Billy Connelly and James MacMillan, the composer (whose outburst about Radical Indy activists being "fascists" and "Mussolini's boot boys" was bizarre and unhinged). I think there are historic reasons why this should be, but I don't have time now.
I don't think Scots are "more socialist" or even more left wing than English voters. But there is a mythology that says so, and the point is that it's widely believed.
However, despite the Better Together campaign antagonising some with its Queen and Country style nationalism, the people it's antagonising were likely to vote Yes anyway. I can see no shift in undecideds.